diff --git a/src/net/java/sip/communicator/impl/protocol/sip/EventPackageSupport.java b/src/net/java/sip/communicator/impl/protocol/sip/EventPackageSupport.java
index 74b06f6ca..1e7dcdf0a 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/EventPackageSupport.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/EventPackageSupport.java
@@ -104,7 +104,7 @@ public class EventPackageSupport
      *            the <code>Timer</code> support which is to execute the
      *            time-based tasks of the new instance
      */
-    public EventPackageSupport(
+    protected EventPackageSupport(
         ProtocolProviderServiceSipImpl protocolProvider,
         String eventPackage,
         int subscriptionDuration,
@@ -153,6 +153,18 @@ protected void addSubscription(String callId, Subscription subscription)
         }
     }
 
+    /**
+     * Gets the name of the event package this instance implements and carried
+     * in the Event and Allow-Events headers.
+     *
+     * @return the name of the event package this instance implements and
+     * carried in the Event and Allow-Events headers
+     */
+    public final String getEventPackage()
+    {
+        return eventPackage;
+    }
+
     /**
      * Safely returns the <code>ServerTransaction</code> associated with a
      * specific <code>RequestEvent</code> or creates a new one if the specified
diff --git a/src/net/java/sip/communicator/impl/protocol/sip/ProtocolProviderServiceSipImpl.java b/src/net/java/sip/communicator/impl/protocol/sip/ProtocolProviderServiceSipImpl.java
index 7cd0cfc5e..dcf45e1c3 100644
--- a/src/net/java/sip/communicator/impl/protocol/sip/ProtocolProviderServiceSipImpl.java
+++ b/src/net/java/sip/communicator/impl/protocol/sip/ProtocolProviderServiceSipImpl.java
@@ -1790,16 +1790,40 @@ public void registerMethodProcessor(String method,
         }
         else
         {
-            Class<? extends MethodProcessor> methodProcessorClass =
-                methodProcessor.getClass();
-            for (Iterator<MethodProcessor> processorIter =
-                processors.iterator(); processorIter.hasNext();)
+            /*
+             * Prevent the registering of multiple instances of one and the same
+             * OperationSet class and take only the latest registration into
+             * account.
+             */
+            Iterator<MethodProcessor> processorIter = processors.iterator();
+            Class<? extends MethodProcessor> methodProcessorClass
+                = methodProcessor.getClass();
+            /*
+             * EventPackageSupport and its extenders provide a generic mechanizm
+             * for building support for a specific event package so allow them
+             * to register multiple instances of one and the same class as long
+             * as they are handling different event packages.
+             */
+            String eventPackage
+                = (methodProcessor instanceof EventPackageSupport)
+                    ? ((EventPackageSupport) methodProcessor).getEventPackage()
+                    : null;
+
+            while (processorIter.hasNext())
             {
-                if (processorIter.next().getClass()
-                    .equals(methodProcessorClass))
-                {
-                    processorIter.remove();
-                }
+                MethodProcessor processor = processorIter.next();
+
+                if (!processor.getClass().equals(methodProcessorClass))
+                    continue;
+                if ((eventPackage != null)
+                        && (processor instanceof EventPackageSupport)
+                        && !eventPackage
+                                .equals(
+                                    ((EventPackageSupport) processor)
+                                        .getEventPackage()))
+                    continue;
+
+                processorIter.remove();
             }
         }
         processors.add(methodProcessor);